[Bug 78221] 3.16 RC1: AMD R9 270 GPU locks up on some heavy 2D activity - GPU VM fault occurs. (possibly DMA copying issue strikes back?)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=78221

--- Comment #14 from t3st3r at mail.ru ---
Nono, v3.15 (release) is okay on my GPU in regard to this bug. That what makes
testing patch tricky.

Bug has been here since unknown. I can tell for sure it plagued all 3.15RCs
(maybe earlier versions as well). But between 3.15rc8 and 3.15 release, bunch
of last-minute DRM fixes landed (0a4ae727d6aa459247b027387edb6ff99f657792).
Except everything else, it corrected this GPU deadlock problem. So v3.15 (the
one and the only) does not exposes that bug.

When I gave a try to v3.16rc1, I figured out bug re-appeared. Hence, looked
like regression in 3.16RCs.

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